We demonstrate a method to easily and quickly determine the local fringe density map of a fringe pattern. The method is based on an isotropic adaptive bandpass filter that is tuned at different frequencies. The modulation map after applying a specific bandpass frequencies filter presents a maximum response in the regions where the bandpass filter and fringe frequencies coincide. We show a set of simulations and experimental results that prove the effectiveness of the proposed method.
© 2011 Optical Society of America
Original Manuscript: September 20, 2010
Revised Manuscript: November 8, 2010
Manuscript Accepted: November 13, 2010
Published: December 27, 2010
J. Vargas, J. Antonio Quiroga, and T. Belenguer, "Local fringe density determination by adaptive filtering," Opt. Lett. 36, 70-72 (2011)